Waterloo weather in August

In August, Waterloo sees average daytime highs of 22°C and overnight lows near 14°C, with 75 mm of rain across 12 wet days and about 14.3 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels dry.

Daylight stretches from about 15 h 12 min at the start of August to 13 h 24 min by month's end. Set against the rest of the year, August is Waterloo's 1st-clearest and 12th-windiest month. For the whole year in context, see Waterloo's year-round climate.

Daytime high
22°
2nd warmest
Overnight low
14°
11th coldest
Rainfall
75 mm
12 wet days
Daylight
14 h 18 min
5:36 AM – 7:57 PM
Cloud cover
65%
1st clearest
Wind
12 km/h
12th windiest
Solar energy
4.42 kWh/m²
Travel score
6.3
out of 10

Waterloo is town in Waterloo municipality, Belgium.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 21°C by the end.

A typical August day in Waterloo reaches about 22°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 28°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12414
22314
32314
42314
52314
62314
72314
82314
92314
102314
112314
122314
132314
142314
152314
162314
172214
182214
192214
202214
212214
222213
232213
242213
252213
262113
272113
282113
292113
302113
312112

How August really feels in Waterloo

Once humidity and wind are folded in, August averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Waterloo weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 62121.38.30.3
Feb / 5811.11.99.70.7
Mar10° / 5611.70.911.52.3
Apr14° / 5011.6013.53.9
May18° / 6412.5015.25.2
Jun21° / 12°6711.9016.25.9
Jul23° / 14°7312.2015.86.4
Aug22° / 14°7512014.36.3
Sep19° / 11°5610.8012.45.8
Oct15° / 5811.2010.44.1
Nov10° / 63120.48.71.9
Dec / 7413.21.57.80.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24357
34258
44258
54159
64159
74159
84060
93961
103961
113961
123763
133862
143763
153763
163664
173763
183664
193565
203565
213565
223565
233565
243565
253565
263565
273565
283565
293565
303565
313664

Chance of precipitation in August

Any precipitation

Waterloo gets around 75 mm of rain over 12 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
437
537
637
737
838
938
1039
1139
1239
1340
1440
1541
1641
1741
1841
1941
2041
2141
2241
2340
2440
2539
2639
2739
2838
2937
3037
3136

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13544192
23544192
33544192
43645182
53645182
63645172
73645172
83745172
93745172
103745172
113844172
123844162
133844162
143943162
153943162
164042162
174042162
184141162
194240162
204339162
214438162
224537152
234736152
244935152
255034142
265332141
275531131
285631121
295730121
305929111
316028111

Wind in August

Winds average 12 km/h in August, the calmest month.

Across August, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 h 12 min at the start of August to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over August. Sunrise moves from 5:14 AM to 6:00 AM, and sunset from 8:23 PM to 7:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.25:148:23
215.15:158:22
315.15:168:20
415.05:188:19
515.05:198:17
614.95:218:15
714.95:228:13
814.85:248:12
914.75:258:10
1014.75:278:08
1114.65:298:06
1214.65:308:04
1314.55:328:03
1414.55:338:01
1514.45:357:59
1614.35:367:57
1714.35:387:55
1814.25:397:53
1914.25:417:51
2014.15:437:49
2114.05:447:47
2214.05:467:44
2313.95:477:42
2413.95:497:40
2513.85:507:38
2613.75:527:36
2713.75:547:34
2813.65:557:32
2913.55:577:29
3013.55:587:27
3113.46:007:25

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.42 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.31 kWh/m² in June across the year — August's 4.42 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.7Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.0Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
313.7Moderate
Planning a trip in August

Is August a good time to visit Waterloo?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.3
Sightseeing
2nd-best month of the year
4.6
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Waterloo for sightseeing.

What to pack for Waterloo in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Waterloo sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

UV index in Waterloo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Waterloo peaks around July 13 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 6Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Waterloo in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Waterloo is worst in April — around 18 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1317 µg/m³Dec 1511 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar17Moderate
Apr18Moderate
May16Moderate
Jun15Moderate
Jul14Moderate
Aug15Moderate
Sep15Moderate
Oct13Moderate
Nov12Moderate
Dec11Good
Location & terrain

Where is Waterloo?

Waterloo sits at 50.7°N, 4.4°E, 119 m above sea level, in Belgium. The nearest listed city is Braine-l'Alleud, 4.0 km away.

Topography around Waterloo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Waterloo.

Within 3 km, the terrain around Waterloo has only modest variations in elevation — a maximum elevation change of 86 m around an average of 114 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 167 m; within 80 km, significant variations in elevation — a maximum elevation change of 512 m.

The land around Waterloo is covered by trees (51%) within 3 km, trees (43%) and cropland (25%) within 16 km, and cropland (34%), trees (31%) and grassland (24%) within 80 km.

3 km
86 m
16 km
167 m
80 km
512 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Braine-l'Alleud 4.0 km · Sint-Genesius-Rode 5.0 km · Rixensart 9.0 km · Beersel 9.0 km · Watermael-Boitsfort 10 km · Uccle 11 km · Auderghem 12 km · Overijse 12 km

Belgium travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 81% of US
price level, 2025
GDP per capita
$60,750
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
5.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 608
Religion
Roman Catholic 57%nonbeliever/agnostic 20%atheist 9%Muslim 7%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Waterloo (50.7147°, 4.3991°, elevation 119 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).